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| Test and Analyses of Bracing Stress on Sand Loess Stratum for Hanguguan Tunnel |
| YANG Jian-min |
| China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031，China |
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Abstract Research purposes: Based on the characteristics of primary bracing stress and its deformation during the excavation of tunnel, the researches are done on the bracing rationality for sand loess tunnel and the rational bracing measures are presented for the purpose of overcoming the problem in construction of large sectional sand loess Hanguguan Tunnel.
Research conclusions : The tests and analyses of the bracing deformation , inner force , bracing stress characteristics of deep-buried large sectional sand loess tunnel show adopting large section steel frame along with the primary bracing of fiber concrete is an effective way for control of soil deformation and ensuring the construction safety to the large sectional sand loess tunnel.
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Received: 08 April 2008
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2008, Vol. 25 
